# Specification Quality Checklist: Modbus Relay Control System

**Purpose**: Validate specification completeness and quality before proceeding to planning
**Created**: 2025-12-28
**Feature**: [spec.md](./spec.md)

## Content Quality

- [x] No implementation details (languages, frameworks, APIs)
  - **Note**: Specification intentionally includes some implementation constraints (Rust, Poem, tokio-modbus) per project constitution requirements (NFR-009, NFR-014, NFR-015). These are architectural constraints, not implementation details of business logic.
- [x] Focused on user value and business needs
- [x] Written for non-technical stakeholders
- [x] All mandatory sections completed

## Requirement Completeness

- [x] No [NEEDS CLARIFICATION] markers remain
  - **Resolution**: FR-023 clarified by user - backend starts successfully even when device unhealthy, frontend displays error as part of Health story
- [x] Requirements are testable and unambiguous
- [x] Success criteria are measurable
- [x] Success criteria are technology-agnostic (no implementation details)
  - **Note**: SC-010 references cargo tarpaulin as measurement tool, which is acceptable for NFR validation
- [x] All acceptance scenarios are defined
- [x] Edge cases are identified
- [x] Scope is clearly bounded
- [x] Dependencies and assumptions identified

## Feature Readiness

- [x] All functional requirements have clear acceptance criteria
- [x] User scenarios cover primary flows
- [x] Feature meets measurable outcomes defined in Success Criteria
- [x] No implementation details leak into specification

## Quality Assessment

**Overall Status**: ✅ **READY FOR PLANNING**

### Strengths
- Comprehensive coverage of 5 prioritized, independently testable user stories
- 37 functional + 21 non-functional requirements provide clear scope
- Edge cases thoroughly documented with specific mitigation strategies
- Success criteria are measurable and aligned with user stories
- Clear boundaries with explicit "Out of Scope" section
- Risk matrix identifies key concerns with mitigation approaches

### Notes
- Specification includes architectural constraints (hexagonal architecture, TDD, TyDD) per project constitution
- These constraints are non-negotiable project requirements, not arbitrary implementation details
- User clarification resolved FR-023 regarding startup behavior when device is unhealthy
- Specification ready for `/sdd:02-plan` stage